The Oceans Pack was created by (myself) JVM and Legojedij in 2008 and includes the Blue Whale, the Colossal Squid, the Sperm Whale, the New Zealand White Shark, and the Double-Tusked Narwhal. The Sperm Whale has a glitch in that when zoomed out it reverts to it's original False Killer Whale model. They utilize multiple biomes, primarily Pelagic and Benthic.
It requires Zoo Tycoon 2 and the Zoo Tycoon 2: Marine Mania expansion to use ingame.